8- The Prophet (SAWA) said, ‘The characteristic of an ignorant person is that he oppresses whoever he associates with, acts unjustly towards his subordinates, flatters his superiors, and his speech is without deliberation.’
[Tuhaf al-`Uqoul, no. 29]

16– Imam Ali (AS) said, ‘The ignorant is one who considers himself knowledgeable about what he is
[in actual fact] ignorant of, and he is content with his own opinion. His attachment to scholars only increases his estrangement
[from knowledge] since he is constantly finding fault with them. He deems invalid the views of those who oppose him, and that which he does not understand he sees as fallacious. If he comes across something that he does not know, he denies it and falsifies it saying, ‘I have never heard of this!’ or ‘I do not see it as possible! or ‘How can it be!’ or ‘Where is this from?’ This is due to his confidence in his own opinion and the paucity of his awareness of his own ignorance.
For this reason he is attached to what he sees as beneficial from his own mistaken opinion, and as a consequence, denies the truth, remains confused in his own ignorance and too proud to seek knowledge.’
[Tuhaf al-`Uqoul, no. 73]

17– Imam al-Sadiq (AS) said, ‘The attributes of the ignorant are that: he answers before listening, objects before understanding, and passes judgment on that which he does not know.’
[A`alam al-Din, no. 303]

30- Imam al-Hasan (AS), when his father asked him the meaning of ignorance, said, ‘It is hastening to snatch up an opportunity before having made oneself capable
[of fulfilling it], and it is to refuse to answer.’
[Ma`ani al-Akhbar, p. 401, no. 62]

31- Imam al-Sadiq (AS) said, ‘Ignorance lies in three things: in compromising one’s brothers, declaring war without the command to do so, and spying into affairs that do not concern one.’
[Tuhaf al-`Uqoul, no. 317]

35- Imam Ali (AS) said, ‘I have said four things which Allah has verified with verses He has revealed in His Book … I said: ‘He who is ignorant of something will oppose it’, and He revealed: “Rather, they deny that whose knowledge they do not comprehend”.
[ Qur’an 10:39]